Section 118 Who may testify
All persons shall be competent to testify unless the Court considers that they are prevented from understanding the question put to them, or from giving rational answer to those questions, by tender years, extreme old age, disease, whether of body and mind, or any other cause of the same kind.
A lunatic is not incompetent to testify, unless he is prevented by his lunacy from understanding the questions put to him and giving rational answers to them.
Reliability of witness
Testimony of a relation or a friend normally would not falsely implicate a person thereby shielding the actual culprit; Narasingh Challan v. State of Orissa, (1997) 2 Crimes 78 (Ori).
It is true that by itself the evidence of a chance witness may not necessarily be false but as has often been said that it is unsafe to be relied upon; Ganpat Kondiba Chavan v. State of Maharashtra, (1997) 2 Crimes 38 (Bom).
It is thoroughly unsafe to rely on the evidence of the tutored witness; Krishna Mohali v. State of Bihar, (1997) 2 Crimes 146 (Pat).
Relative or interested witnesses are not necessarily unreliable witnesses; Sawai Ram v. State of Rajasthan, (1997) 2 Crimes 148 (Raj).
No doubt, an approver in the eye of law is a competent witness; Murlidharan v. State of Tamil Nadu, (1997) 1 Crimes 515 (Mad).
Evidence of child witness is not reliable who is under the influence of tutoring; Changan Dame v. State of Gujarat, 1994 Cr LJ 66 (SC).
Testimony of independent witness